apply Vojtech suggestions - 2

Author: marino39

common.go

@@ -80,7 +80,7 @@ type Options struct {
 }
 
 func (o Options) WithDefaults() Options {
-	o.FileSystem = cmp.Or(o.FileSystem, local.NewLocalFS(""))
+	o.FileSystem = cmp.Or(o.FileSystem, storage.FS(local.NewLocalFS("")))
 	o.FilePrefetchTimeout = cmp.Or(o.FilePrefetchTimeout, defaultPrefetchTimeout)
 	o.FileRollPolicy = cmp.Or(o.FileRollPolicy, NewFileSizeRollPolicy(uint64(defaultFileSize)))
 	if o.NewEncoder == nil {
@@ -226,7 +226,7 @@ func (f *File) open(ctx context.Context, fs storage.FS) (io.ReadCloser, error) {
 	}
 
 	file, err := fs.Open(ctx, f.legacyPath(), nil)
-	if err != nil && strings.Contains(err.Error(), "not exist") {
+	if err != nil && storage.IsNotExist(err) {
 		return nil, ErrFileNotExist
 	}
 	if err != nil {

storage/errors.go

@@ -0,0 +1,7 @@
+package storage
+
+import "github.com/Shopify/go-storage"
+
+func IsNotExist(err error) bool {
+	return storage.IsNotExist(err)
+}

writer.go

@@ -88,7 +88,7 @@ func NewWriter[T any](opt Options) (Writer[T], error) {
 		firstBlockNum: lastBlockNum + 1,
 		lastBlockNum:  lastBlockNum,
 		fileIndex:     fileIndex,
-		buffer:        bytes.NewBuffer(make([]byte, 0, defaultBufferSize)),
+		buffer:        bytes.NewBuffer(make([]byte, 0, defaultFileSize)),
 	}, nil
 }